The 2017 USA Walker Cup competitor qualified for his first U.S. Open by shooting 9-under 134 in the Memphis, Tenn., sectional held at Ridgeway Country Club and Colonial Country Club. Thornberry enjoyed a stellar 2017 amateur/collegiate season, winning the NCAA Division I individual title at Rich Harvest Farms outside of Chicago as well as the prestigious Jones Cup at Ocean Forest Golf Club in Sea Island, Ga. Has posted 11 college victories at the University of Mississippi where he is a rising senior. Became the first Ole Miss golfer to compete in the Walker Cup. A couple of weeks earlier, he defeated world No. 1 Joaquin Niemann in the Round of 64 of the 117th U.S. Amateur at The Riviera Country Club.
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